溶解氧和光照对狐尾藻衰亡过程中氮、磷和碳释放的影响.doc

溶解氧光照对狐尾藻衰亡过程中氮、磷和碳释放的影响摘要狐尾藻(Myriophyllum spicatum)进行浸泡试验，考察光照和溶解氧对因植物组织溶解而导致的污染物释放的影响。研究结果表明曝气总释放量总释放量CODCr平均释放量66.83mg/L，为不曝气组2倍以上。CODCr升高。曝气组植物残体破碎导致表面积增加对磷吸收的促进程度强于对附着作用的降低以及植物残体磷释放作用的增加，综合作用下导致水中磷浓度降低。曝气抑制了硝氮、总磷、溶解性总磷和溶解性无机磷释放。(2)有光照组总氮平均浓度3.13mg/L，为无光照组的1.24倍。有光照组总磷浓度(30.53mg/L)为无光照组的3.28倍。有光照组CODCr浓度(32.51mg/L)为无光照组的2.46倍。光照狐尾藻氮、磷碳关键词浸泡狐尾藻溶解氧光照释放illumination on the nitrogen, phosphorus and carbon release ofmyriophyllum spicatum Abstract: The Myriophyllum spicatum after kill out were cut into small sections, in the length of 0.5-1 cm. They were soaked in water beaker adding chloroforms, inactive the activity of microbe, in artificial climate room (keep the temperature of 5 ℃). Aimed to investigate the influence of illumination and dissolve oxygen on pollutant releases resulted from the dissolved plant tissues. The average release amount of the total nitrogen (TN) concentration under aeration condition was 3.33mg/L, which was 6.39% higher than not aeration group. The average release amount of total phosphorus (TP) concentration was 15.07mg/L, which was 50% lower than not aeration group. The average CODCr concentration releasing amount was 66.83mg/L under aeration condition, which was more than 2 times of the aeration group. Aeration suppressed the release of the nitrate. Under mixing function, the abundant collision and keeping in touch of plant residue and aqueous solution, accelerated nitrogen (N) and carbon (C) of plant residue transfer into water, resulted in rising total N, ammonia nitrogen (NH3-N), organic nitrogen (Org-N) and CODCr under the aeration condition. Under the aeration condition, promotion extent of phosphorus (P) absorb through the increasing surface of the plant tissues caused by the aeration was stronger than inhibition extent of adhere function and the P release function enhanced by the plant tissues, thus caused the reduction of P amount in the water. Aeration suppressed the release of nitrate (NO3--N), TP, dissolving total phosphorus (